linux-kernel - Re: [PATCH v6 7/8] PCI: qcom: Fix the cfg for X1E80100 SoC

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Message-ID: <20241014172000.GA612658@bhelgaas>
Date: Mon, 14 Oct 2024 12:20:00 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Qiang Yu <quic_qianyu@...cinc.com>
Cc: manivannan.sadhasivam@...aro.org, vkoul@...nel.org, kishon@...nel.org,
	robh@...nel.org, andersson@...nel.org, konradybcio@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, mturquette@...libre.com,
	sboyd@...nel.org, abel.vesa@...aro.org, quic_msarkar@...cinc.com,
	quic_devipriy@...cinc.com, dmitry.baryshkov@...aro.org,
	kw@...ux.com, lpieralisi@...nel.org, neil.armstrong@...aro.org,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v6 7/8] PCI: qcom: Fix the cfg for X1E80100 SoC

On Fri, Oct 11, 2024 at 03:41:41AM -0700, Qiang Yu wrote:
> Currently, the cfg_1_9_0 which is being used for X1E80100 has config_sid
> callback in its ops and doesn't disable ASPM L0s. However, as same as
> SC8280X, PCIe controllers on X1E80100 are connected to SMMUv3 and it is
> recommended to disable ASPM L0s. Hence reuse cfg_sc8280xp for X1E80100.

Say something specific in the subject line.  Apparently you need to
disable ASPM L0s for this SoC, which is important to know and much
more useful than "Fix the cfg".

> Fixes: 6d0c39324c5f ("PCI: qcom: Add X1E80100 PCIe support")
> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 468bd4242e61..c533e6024ba2 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1847,7 +1847,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-sm8450-pcie0", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
> -	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_1_9_0 },
> +	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_sc8280xp },
>  	{ }
>  };
>  
> -- 
> 2.34.1
>